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Electrical Engineering
Electrical Control Systems
Quiz 3
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Q.1
Pressure error can be measured by which of the following ?
Differential bellows and straingauge
Selsyn
Strain gauge
Strain gauge and potentiometer
Q.2
Is the reference input minus the primary feedback.
Manipulated variable
Zero sequence
Actuating signal
Primary feedback
Q.3
Which of the following statements is correct for any closed loop system ?
All the co-efficients can have zero value
All the co-efficients are always non-zero
Only one of the static error co-efficients has a finite non-zero value
None of the above
Q.4
The initial response when tne output is not equal to input is called
Transient response
Error response
Dynamic response
Either of the above
Q.5
The second derivative input signals modify which of the following ?
The time constant of the system
Damping of the system
The gain of the system
The time constant and suppress the oscillations
None of the above
Q.6
As a result of introduction of negative feedback which of the following will not decrease?
Band width
Overall gain
Distortion
Instability
Q.7
an be extended to systems which are time-varying ?
Bode-Nyquist stability methods
Transfer functions
Root locus design
State model representatives
Q.8
If the gain of the critical damped system is increased it will behave as
oscillatory
critically damped
overdamped
underdamped
none of the above
Q.9
The transfer function technique is considered as inadequate under which of the following conditions ?
Systems having complexities and non-linearities
Systems having stability problems
Systems having multiple input disturbances
All of the above
Q.10
In a system zero initial condition means that
The system is at rest and no energy is stored in any of its components
The system is working with zero stored energy
The system is working with zero reference signal
None of the above
Q.11
Any externally introduced signal affecting the controlled output is called a
feedback
stimulus
signal
gain control
Q.12
Spring constant in force-voltage analogy is analogous to
capacitance
reciprocal of capacitance
current
resistance
Q.13
In an open loop control system
Output is independent of control input
Output is dependent on control input
Only system parameters have effect on the control output
None of the above
Q.14
Which of the following is an electromagnetically device ?
Induction relay
Thermocouple
LVDT
Any of the above
None of the above
Q.15
The position and velocity errors of a type-2 system are
constant, constant
constant, infinity
zero, constant
zero, zero
Q.16
In a stable control system backlash can cause which of the following ?
Underdamping
Overdamping
Poor stability at reduced values of open loop gain
Low-level oscillations
Q.17
The transfer function is applicable to which of the following ?
Linear and time-in variant systems
Linear and time-variant systems
Linear systems
Non-linear systems
None of the above
Q.18
The term backlash is associated with
servomotors
induction relays
gear trains
any of the above
Q.19
In an automatic control system which of the following elements is not used ?
Error detector
Final control element
Sensor
Oscillator
Q.20
With feedback _____ increases.
system stability
sensitivity
gain
effects of disturbing signals
Q.21
A car is running at a constant speed of 50 km/h, which of the following is the feedback element for the driver ?
Clutch
Eyes
Needle of the speedometer
Steering wheel
None of the above
Q.22
By which of the following the control action is determined when a man walks along a path?
Brain
Hands
Legs
Eyes
Q.23
A control system with excessive noise, is likely to suffer from
saturation in amplifying stages
loss of gain
vibrations
oscillations
Q.24
Technique gives quick transient and stability response
Root locus
Bode
Nyquist
Nichols
Q.25
A control system in which the control action is somehow dependent on the output is known as
Closed loop system
Semiclosed loop system
Open system
None of the above
Q.26
Due to which of the following reasons excessive bond width in control systems should be avoided ?
It leads to slow speed of response
It leads to low relative stability
Noise is proportional to band width
None of the above
Q.27
Hydraulic torque transmission system is analog of
amplidyne set
resistance-capacitance parallel circuit
motor-generator set
any of the above
Q.28
If a step function is applied to the input of a system and the output remains below a certain level for all the time, the system is
not necessarily stable
stable
unstable
always unstable
any of the above
Q.29
Which of the following can be measured by LVDT?
Displacement
Velocity
Acceleration
Any of the above
Q.30
The frequency and time domain are related through which of the following?
Laplace Transform and Fourier Integral
Laplace Transform
Fourier Integral
Either (B) or (C)
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